package com.whut.config;

import com.whut.common.JacksonObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.util.List;

/**
 * @ClassName:WebMvcConfig
 * @Description:
 * @Author:liumengying
 * @Date: 2022/8/3 18:01
 * Version v1.0
 */
@Slf4j
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
    /**
     * 设置静态资源映射
     * @param registry 资源处理器注册表对象
     */
    protected void addResourceHandlers(ResourceHandlerRegistry registry){
        log.info("开始进行静态资源映射！");
        //注册分为两个部分
        //1.指定需要映射处理的URL模式
        //2.URL对应的资源所在位置
        registry.addResourceHandler("/backend/**")
                .addResourceLocations("classpath:/backend/");
        registry.addResourceHandler("/front/**")
                .addResourceLocations("classpath:/front/");
        registry.addResourceHandler("/**")
                .addResourceLocations("classpath:/static/")
                .addResourceLocations("classpath:/templates/");
    }
    /**
     * 扩展MVC框架的消息转换器
     * converters
     */
    @Override
    protected void extendMessageConverters(List<HttpMessageConverter<?>> converters){
        log.info("扩展消息转换器....");
        //创建消息转换器对象
        final MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter=
                new MappingJackson2HttpMessageConverter();
        //设置对象转换器，底层使用自定义的Json对象映射器将Java对象转换为json
        mappingJackson2HttpMessageConverter.setObjectMapper(new JacksonObjectMapper());
        //将上面的消息转换器对象追加到mvc框架的转换器集合中
        converters.add(0,mappingJackson2HttpMessageConverter);
    }

}
